4021641 has 24 divisors (see below), whose sum is σ = 6431880. Its totient is φ = 2405376.

The previous prime is 4021627. The next prime is 4021651. The reversal of 4021641 is 1461204.

4021641 is a `hidden beast` number, since 4 + 0 + 21 + 641 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 41616 + 3980025 = 204^2 + 1995^2 .

It is not a de Polignac number, because 4021641 - 2⁷ = 4021513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4021601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3865 + ... + 4793.

It is an arithmetic number, because the mean of its divisors is an integer number (267995).

Almost surely, 2^4021641 is an apocalyptic number.

It is an amenable number.

4021641 is a deficient number, since it is larger than the sum of its proper divisors (2410239).

4021641 is a wasteful number, since it uses less digits than its factorization.

4021641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 985 (or 982 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 4021641 is about 2005.4029520273. The cubic root of 4021641 is about 159.0258650221.

Adding to 4021641 its reverse (1461204), we get a palindrome (5482845).

The spelling of 4021641 in words is "four million, twenty-one thousand, six hundred forty-one".